Mercurial > hg > graal-compiler

annotate graal/com.oracle.jvmci.asm/src/com/oracle/jvmci/asm/Buffer.java @ 21708:6df25b1418be

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moved com.oracle.asm.** to jvmci-util.jar (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 18:06:44 +0200
parents graal/com.oracle.graal.asm/src/com/oracle/graal/asm/Buffer.java@5a7b82c1514e
children
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1 /*
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2 * Copyright (c) 2009, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.jvmci.asm;
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24
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25 import java.util.*;
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26
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27 /**
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28 * Code buffer management for the assembler. Support for little endian and big endian architectures
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29 * is implemented using subclasses.
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30 */
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31 abstract class Buffer {
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32
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33 protected byte[] data;
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34 protected int position;
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35
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36 public Buffer() {
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37 data = new byte[AsmOptions.InitialCodeBufferSize];
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38 }
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39
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40 public int position() {
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41 return position;
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42 }
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43
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44 public void setPosition(int position) {
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45 assert position >= 0 && position <= data.length;
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46 this.position = position;
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47 }
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48
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49 /**
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50 * Closes this buffer. No extra data can be written to this buffer after this call.
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51 *
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52 * @param trimmedCopy if {@code true}, then a copy of the underlying byte array up to (but not
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53 * including) {@code position()} is returned
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54 * @return the data in this buffer or a trimmed copy if {@code trimmedCopy} is {@code true}
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55 */
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56 public byte[] close(boolean trimmedCopy) {
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57 byte[] result = trimmedCopy ? Arrays.copyOf(data, position()) : data;
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58 data = null;
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59 return result;
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60 }
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61
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62 public byte[] copyData(int start, int end) {
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63 if (data == null) {
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64 return null;
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65 }
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66 return Arrays.copyOfRange(data, start, end);
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67 }
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68
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69 /**
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70 * Copies the data from this buffer into a given array.
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71 *
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72 * @param dst the destination array
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73 * @param off starting position in {@code dst}
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74 * @param len number of bytes to copy
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75 */
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76 public void copyInto(byte[] dst, int off, int len) {
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77 System.arraycopy(data, 0, dst, off, len);
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78 }
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79
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80 protected void ensureSize(int length) {
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81 if (length >= data.length) {
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82 data = Arrays.copyOf(data, length * 4);
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83 }
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84 }
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85
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86 public void emitBytes(byte[] arr, int off, int len) {
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87 ensureSize(position + len);
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88 System.arraycopy(arr, off, data, position, len);
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89 position += len;
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90 }
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91
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92 public void emitByte(int b) {
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93 position = emitByte(b, position);
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94 }
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95
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96 public void emitShort(int b) {
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97 position = emitShort(b, position);
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98 }
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99
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100 public void emitInt(int b) {
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101 position = emitInt(b, position);
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102 }
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103
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104 public void emitLong(long b) {
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105 position = emitLong(b, position);
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106 }
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107
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108 public int emitBytes(byte[] arr, int pos) {
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109 final int len = arr.length;
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110 final int newPos = pos + len;
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111 ensureSize(newPos);
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112 System.arraycopy(arr, 0, data, pos, len);
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113 return newPos;
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114 }
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115
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116 public int emitByte(int b, int pos) {
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117 assert NumUtil.isUByte(b) || NumUtil.isByte(b);
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118 int newPos = pos + 1;
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119 ensureSize(newPos);
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120 data[pos] = (byte) (b & 0xFF);
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121 return newPos;
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122 }
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123
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124 public abstract int emitShort(int b, int pos);
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125
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126 public abstract int emitInt(int b, int pos);
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127
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128 public abstract int emitLong(long b, int pos);
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129
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130 public int getByte(int pos) {
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131 return data[pos] & 0xff;
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132 }
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133
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134 public abstract int getShort(int pos);
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135
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136 public abstract int getInt(int pos);
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137
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138 public static final class BigEndian extends Buffer {
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139
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diff changeset
140 @Override
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141 public int emitShort(int b, int pos) {
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70bb8df01b6e Allow signed values in Buffer.emit(Byte|Short).
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parents: 14031
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142 assert NumUtil.isUShort(b) || NumUtil.isShort(b);
4142
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143 int newPos = pos + 2;
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144 ensureSize(pos + 2);
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145 data[pos] = (byte) ((b >> 8) & 0xFF);
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146 data[pos + 1] = (byte) (b & 0xFF);
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147 return newPos;
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148 }
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149
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150 @Override
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151 public int emitInt(int b, int pos) {
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152 int newPos = pos + 4;
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153 ensureSize(newPos);
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154 data[pos] = (byte) ((b >> 24) & 0xFF);
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155 data[pos + 1] = (byte) ((b >> 16) & 0xFF);
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156 data[pos + 2] = (byte) ((b >> 8) & 0xFF);
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157 data[pos + 3] = (byte) (b & 0xFF);
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158 return newPos;
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159 }
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160
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161 @Override
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162 public int emitLong(long b, int pos) {
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163 int newPos = pos + 8;
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164 ensureSize(newPos);
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165 data[pos] = (byte) ((b >> 56) & 0xFF);
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166 data[pos + 1] = (byte) ((b >> 48) & 0xFF);
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167 data[pos + 2] = (byte) ((b >> 40) & 0xFF);
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168 data[pos + 3] = (byte) ((b >> 32) & 0xFF);
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169 data[pos + 4] = (byte) ((b >> 24) & 0xFF);
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170 data[pos + 5] = (byte) ((b >> 16) & 0xFF);
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171 data[pos + 6] = (byte) ((b >> 8) & 0xFF);
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172 data[pos + 7] = (byte) (b & 0xFF);
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173 return newPos;
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174 }
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175
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176 @Override
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177 public int getShort(int pos) {
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178 return (data[pos + 0] & 0xff) << 8 | (data[pos + 1] & 0xff) << 0;
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179 }
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180
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181 @Override
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182 public int getInt(int pos) {
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183 return (data[pos + 0] & 0xff) << 24 | (data[pos + 1] & 0xff) << 16 | (data[pos + 2] & 0xff) << 8 | (data[pos + 3] & 0xff) << 0;
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184 }
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185 }
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186
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187 public static final class LittleEndian extends Buffer {
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188
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189 @Override
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190 public int emitShort(int b, int pos) {
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70bb8df01b6e Allow signed values in Buffer.emit(Byte|Short).
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parents: 14031
diff changeset
191 assert NumUtil.isUShort(b) || NumUtil.isShort(b);
4142
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diff changeset
192 int newPos = pos + 2;
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193 ensureSize(newPos);
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194 data[pos] = (byte) (b & 0xFF);
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195 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
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196 return newPos;
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197 }
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198
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199 @Override
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200 public int emitInt(int b, int pos) {
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diff changeset
201 int newPos = pos + 4;
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diff changeset
202 ensureSize(newPos);
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203 data[pos] = (byte) (b & 0xFF);
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diff changeset
204 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
205 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
206 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
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diff changeset
207 return newPos;
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diff changeset
208 }
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209
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parents:
diff changeset
210 @Override
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parents:
diff changeset
211 public int emitLong(long b, int pos) {
4142
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diff changeset
212 int newPos = pos + 8;
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
213 ensureSize(newPos);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
214 data[pos] = (byte) (b & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
215 data[pos + 1] = (byte) ((b >> 8) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
216 data[pos + 2] = (byte) ((b >> 16) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
217 data[pos + 3] = (byte) ((b >> 24) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
218 data[pos + 4] = (byte) ((b >> 32) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
219 data[pos + 5] = (byte) ((b >> 40) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
220 data[pos + 6] = (byte) ((b >> 48) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
221 data[pos + 7] = (byte) ((b >> 56) & 0xFF);
bc8527f3071c Adjust code base to new level of warnings.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 3733
diff changeset
222 return newPos;
3733
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parents:
diff changeset
223 }
e233f5660da4 Added Java files from Maxine project.
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parents:
diff changeset
224
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
225 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
226 public int getShort(int pos) {
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diff changeset
227 return (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
3733
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parents:
diff changeset
228 }
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parents:
diff changeset
229
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parents:
diff changeset
230 @Override
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
231 public int getInt(int pos) {
7530
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diff changeset
232 return (data[pos + 3] & 0xff) << 24 | (data[pos + 2] & 0xff) << 16 | (data[pos + 1] & 0xff) << 8 | (data[pos + 0] & 0xff) << 0;
3733
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parents:
diff changeset
233 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
234 }
17207
5a7b82c1514e [SPARC] Add functionality to be able to do assembly in two passes (knowing offsets of forward branches)
Stefan Anzinger <stefan.anzinger@oracle.com>
parents: 15908
diff changeset
235
5a7b82c1514e [SPARC] Add functionality to be able to do assembly in two passes (knowing offsets of forward branches)
Stefan Anzinger <stefan.anzinger@oracle.com>
parents: 15908
diff changeset
236 public void reset() {
5a7b82c1514e [SPARC] Add functionality to be able to do assembly in two passes (knowing offsets of forward branches)
Stefan Anzinger <stefan.anzinger@oracle.com>
parents: 15908
diff changeset
237 position = 0;
5a7b82c1514e [SPARC] Add functionality to be able to do assembly in two passes (knowing offsets of forward branches)
Stefan Anzinger <stefan.anzinger@oracle.com>
parents: 15908
diff changeset
238 }
3733
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
239 }